Re: Graphics export to BMP and JPEG
- To: mathgroup at smc.vnet.net
- Subject: [mg82649] Re: Graphics export to BMP and JPEG
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Sat, 27 Oct 2007 06:01:28 -0400 (EDT)
- References: <ffsdbd$ojr$1@smc.vnet.net>
Hi, why, please tell me WHY, *W_H_Y* do you export a bitmap when you have a vector graphic ? For an ordianry Plot[] result the vector graphic has a smaller file size can printed in any resolution. It is hopeless to make a bitmap because your screen has ca 72 dpi, a medium quality printer 600 dpi and your eye 2200 dpi .. you will never have the right size/resolution. Regards Jens Hannes Kessler wrote: > Hello all, > > what options are recommended for > Export["image.bmp",_Graphics,ImageSize->..,ImageResolution->..], also > for image.jpg, image.tiff in order to get image files of the same > quality as right mouse clicking the image in the notebook and copying > as a bitmap or metafile? I tried different values of ImageSize- >> ..,ImageResolution->.. but with quite poor results. The _Graphics > were ordinary plots created by Plot or ListPlot. > > For example, Export["image.bmp",_Graphics,ImageSize- >> Large,ImageResolution->72 n] with n=1,2,3,... did not improve the > image quality with increasing n. I checked with Irfan view that with > increasing ImageResolution the default print size of the image > decreased proportionally. In other words, the image resolution at > constant image size remained always constant (and poor). > > Increasing ImageSize at constant ImageResolution increased > proportionally both the default print size and the number of pixels as > one would expect. But artificially exporting the graphics with large > ImageSize and then sizing down does not help as the text size remains > constant during the export even when ImageSize increases and thus > sizing down subsequently would make the text invisible. > > As a side question, what are the default sizes for ImageSize->Large, > Medium or Small in different situations? Are they documented > somewhere? > > Thanks in advance, > Hannes Kessler > >